Chemical Reactions

A substance that is formed as the result of a chemical reaction is a __________________

• Product

• Reactant

• Starters

• Enders

Which one shows that a chemical reaction has occurred?

• dissolving

• melting

• formation of a gas

• bending

In a chemical reaction, bonds are broken and new bonds are formed that create new substances. The bonds that are broken are called what?

• Reactants
• Products
• Atoms
• Catalysts

The Law of Conservation of Mass states

• that matter exists in all states and reacts the same
• that matter can only be changed into new substances by introducing a catalyst
• that matter exists in the same state throughout any chemical change
• that matter cannot be created or destroyed and that the mass of the products must equal the mass of the reactants

How many Al atoms are in this compound?         4Al₂O₃

• 2
• 8
• 6
• 4

In a chemical reaction, atoms ________ and form new bonds.

True or False
In a chemical reaction, no new atoms are created, and no atoms are destroyed. 

• true
• false

A number in front of a chemical formula in an equation that indicates how many molecules or atoms of each reactant and product are involved in a reaction.

• Coefficient
• reactant
• subscript
• product 

In a chemical reaction

• The atoms of the reactants always stay together to form the products
• The atoms of the reactants unbond, rearrange, and then rebond to form the products
• New atoms are formed which combine to make the products
• Some atoms disappear while others multiply to form the products

What type of reaction is illustrated below?
FeS + Hal --> H₂S + FeCl

• synthesis
• decomposition
• single replacement
• double replacement